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  • Other Sources  (14)
  • 2015-2019  (2)
  • 1975-1979  (12)
  • 1
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    A study of the potential impacts of space utilization (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Because the demand for comprehensive impact analysis of space technologies will increase with the use of space shuttles, the academic social sciences/humanities community was surveyed in order to determine their interests in space utilization, to develop a list of current and planned courses, and to generate a preliminary matrix of relevant social sciences. The academic scope/focus of a proposed social science space-related journal was identified including the disciplines which should be represented in the editorial board/reviewer system. The time and funding necessary to develop a self-sustaining journal were assessed. Cost income, general organizational structure, marking/distribution and funding sources were analyzed. Recommendations based on the survey are included.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-163131
    Format: application/pdf
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  • 2
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    Do surges heat the corona (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A comparison of X-ray filtergrams obtained during the Skylab mission 8 hr before and within 4 hr following 54 active region surges on the disk revealed only 6 cases of long-enduring, large-scale (exceeding 10,000 km) coronal enhancements that might have been associated with surge activity. It is concluded that there is no evidence for any substantial increase in the temperature or amount of coronal material during reported surges.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 54; Sept
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  • 3
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    Sprayable low density ablator and application process (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A sprayable, low density ablative composition is described consisting esentially of: (1) 100 parts by weight of a mixture of 25-65% by weight of phenolic microballoons, 0-20% by weight of glass microballoons, 4-10% by weight of glass fibers, 25-45% by weight of an epoxy-modified polyurethane resin, 2-4% by weight of a bentonite dispersing aid, and 1-2% by weight of an alcohol activator for the bentonite; (2) 1-10 parts by weight of an aromatic amine curing agent; and (3) 200-400 parts by weight of a solvent.
    Keywords: COMPOSITE MATERIALS
    Format: application/pdf
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  • 4
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    The NASA Standard 20 Ampere Hour Nickel-Cadmium Battery Manual (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The NASA standard 20 ampere hour spacecraft nickel-cadmium battery in described. Mechanical electrical and thermal data are supplied. Both qualification and acceptance tests are described. Information on handling and storage is given.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-166700 , MMS-408-2101-0003
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  • 5
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    MLSO Mark III K-Coronameter Observations of the CME Rate from 1989-1996 (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We report here an attempt to fill the 1990-1995 gap in the CME (coronal mass ejection) rate using the Mauna Loa Solar Observatory (MLSO)'s Mark III (Mk3) K-coronameter. The Mk3 instrument observed routinely several hours most days beginning in 1980 until it was upgraded to Mk4 in 1999. We describe the statistical properties of the CMEs detected during 1989-1996, and we determine a CME rate for each of those years. Since spaceborne coronagraphs have more complete duty cycles than a ground-based instrument at a single location, we compare the Mk3-derived CME rate from 1989 with the SMM C/P (Solar Maximum Mission Coronagraph/Polarimeter) coronagraph, and from 1996 with the SOHO (Solar and Hellospheric Observatory) LASCO (Large Angle and Spectrometric COronagraph) coronagraphs.
    Keywords: Astronomy; Solar Physics
    Type: GSFC-E-DAA-TN27464 , Solar Physics (ISSN 0038-0938) (e-ISSN 1573-093X); 290; 10; 2951-2962
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  • 6
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    JT8D and JT9D jet engine performance improvement program. Task 1: Feasibility analysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: JT8D and JT9D component performance improvement concepts which have a high probability of incorporation into production engines were identified and ranked. An evaluation method based on airline payback period was developed for the purpose of identifying the most promising concepts. The method used available test data and analytical models along with conceptual/preliminary designs to predict the performance improvements, weight, installation characteristics, cost for new production and retrofit, maintenance cost, and qualitative characteristics of candidate concepts. These results were used to arrive at the concept payback period, which is the time required for an airline to recover the investment cost of concept implementation.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-159449 , PWA-5518-38
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  • 7
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    Is There a CME Rate Floor? CME and Magnetic Flux Values for the Last Four Solar Cycle Minima (2017)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The recent prolonged activity minimum has led to the question of whether there is a base level of the solar magnetic field evolution that yields a ''floor'' in activity levels and also in the solar wind magnetic field strength. Recently, a flux transport model coupled with magneto-frictional simulations has been used to simulate the continuous magnetic field evolution in the global solar corona for over 15 years, from 1996 to 2012. Flux rope eruptions in the simulations are estimated (Yeates), and the results are in remarkable agreement with the shape of the SOlar Heliospheric Observatory/Large Angle and Spectrometric Coronagraph Experiment coronal mass ejection (CME) rate distribution. The eruption rates at the two recent minima approximate the observed-corrected CME rates, supporting the idea of a base level of solar magnetic activity. In this paper, we address this issue by comparing annual averages of the CME occurrence rates during the last four solar cycle minima with several tracers of the global solar magnetic field. We conclude that CME activity never ceases during a cycle, but maintains a base level of 1 CME every 1.5 to approx. 3 days during minima. We discuss the sources of these CMEs.
    Keywords: Solar Physics
    Type: GSFC-E-DAA-TN53060 , The Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 851; 2; 142
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  • 8
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    Evidence linking coronal transients to the evolution of coronal holes (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The positions of X-ray coronal transients outside of active regions observed during Skylab were superposed on H-alpha synoptic charts and coronal hole boundaries for seven solar rotations. A detailed spatial association between the transients and neutral lines was confirmed. It was found that most of the transients were related to large-scale changes in coronal hole area and tended to occur on the borders of evolving equatorial holes.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 58; July 197
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  • 9
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    X-ray analysis of a polar plume (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Polar plumes have been detected in X-rays with the Skylab S-054 experiment. Observations of one well-observed plume are analyzed and the plasma pressure is determined. An isothermal model in hydrostatic equilibrium is found to require unacceptably low temperatures. A hydrodynamic model is proposed which is consistent with earlier white light and EUV observations. Calculations indicate that the total outward mass flux in polar plumes is comparable to that in high speed solar wind streams expected from a polar coronal hole.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 58; July 197
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  • 10
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    Coronal X-ray enhancements associated with H-alpha filament disappearances (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The X-ray telescope experiment aboard the Skylab/ATM mission provided high-resolution soft X-ray images of the lower corona away from active regions, revealing frequent large-scale transient X-ray enhancements which could often be associated with the disappearance of H-alpha filaments. The X-ray emitting structures featured peak brightnesses similar to those of nonflaring active region structures, durations from 3 to 40 hours, shapes that in general outlined the preexisting H-alpha filaments to as large as 400,000 km, apparent expansion velocities of the order of tens of km/sec, and observed peak temperatures of the order of a few million degrees. One such event is described and analyzed in detail. Two explanations of the events are discussed: (1) excess cool material is present in the filament cavity, contributing to the X-ray enhancement, and (2) the enhancement is due to the compression of preexisting material by a changing magnetic field.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 48; May 1976
    Format: text
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